Control of “Picnic Beetles” on Red Raspberries, 1982

Seven insecticides were evaluated for the control of picnic beetles (Coleoptera: Nitidulidae) on raspberries Wooster, OH. Raspberry rows were 18 inch wide with 6 ft between the center of adjacent rows. Plots were 9 ft long with four replications per treatment in randomized blocks. Treatments were applied on Jul 12 with a hand operated C02 sprayer operating at 45 psi that was equipped with a TeeJet D3 disc and number 13 core. Sprays were applied to bushes at the rate of 79 gal/acr e. At each time interval after application five ripe berries were harvested from a single replicate and placed in a 150 × 25 mm tissue culture dish. Ten picnic beetles of unknown age and sex were released in a dish and allowed to feed in the confines of the dish for 24 hr before mortality was recorded.